文献类型：期刊文献

英文题名：Fall fertilization during nursery production increases nitrogen status of Purshia tridentata seedlings: implications for outplanting

作者：Dumroese, R. Kasten[1] Zhu, Yan[2] Acevedo, Manuel A.[3] Pinto, Jeremiah R.[1] Alvarez-Maldini, Carolina E.[4] Liu, Yong[5]

第一作者：Dumroese, R. Kasten

通信作者：Dumroese, RK[1]

机构：[1]US Dept Agr, Forest Serv, Rocky Mt Res Stn, 1221 South Main St, Moscow, ID 83843 USA;[2]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[3]Sede BioBio, Inst Forestal, Concepcion, Chile;[4]Univ Ohiggins, Inst Ciencias Agroalimentarias Anim & Ambientales, San Fernando, Chile;[5]Beijing Forestry Univ, Key Lab Silviculture & Conservat, Minist Educ, 35 Qinghua Donglu, Beijing 100083, Peoples R China

年份：0

外文期刊名：RESTORATION ECOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000975499900001)】；

基金：This research was completed as part of two on-site scientific exchanges. The first was between the Rocky Mountain Research Station (RMRS) within the U.S. Department of Agriculture Forest Service (USDA-FS) and Beijing Forestry University (YZ, PhD candidate). The second was between RMRS and the Forestry Institute of Chile (Instituto Forestal de Chile [INFOR]; MAA, visiting scientist). Funding was provided in part by RMRS; the USDA-FS National Center for Reforestation, Nurseries, and Genetic Resources; the Fundamental Research Funds for the Central Universities (Contract TD2011-08, JD2011-3; YZ); and INFOR (MAA). The authors thank Drs Chelcy Ford Miniat and Deborah Page-Dumroese, USDA-FS RMRS for review comments. Data are available upon request. The authors declare no conflicts of interest. The opinions, findings, and conclusions expressed in this information product are those of the authors and should not be construed to represent any official USDA or U.S. Government determination or policy.

语种：英文

外文关键词：antelope bitterbrush; nitrogen loading; nitrogen translocation; nitrogen use efficiency; seedling quality

摘要：During container nursery production of Purshia tridentata (antelope bitterbrush), we found that three fall fertilization applications successfully loaded plants with nitrogen (N) with little effect on plant biomass. Using N-15-labeled fertilizer to track N movements, we observed that N-loaded seedlings attained luxury consumption and ultimately translocated more N toward roots. In trees, such N-loading efforts have been reported to increase seedling survival and growth after outplanting by improving initial root growth. This leads to enhanced access to water and nutrients that increases overall plant competitiveness and performance. Our results add, in general, to the paucity of information concerning fall fertilization of shrubs, and specifically that this technique offers promise to enhance the quality of antelope bitterbrush seedlings. This could improve overall planting success of this important shrub native to western United States rangelands. Increasing the effectiveness of planting antelope bitterbrush, which can often improve restoration trajectories more than direct seeding or reliance on natural regeneration of this species, could accelerate the pace and scope of critical habitat restoration. Restoration is needed as antelope bitterbrush abundance has been reduced across the landscape because of conversion to agriculture, invasion by nonnative annual grasses, and an increase in fire frequency and intensity, among other reasons. In addition, this species provides browse for ungulates and critical habitat for at-risk species, such as Centrocercus urophasianus (greater sage-grouse). Although N loading antelope bitterbrush has potential to improve outplanting performance, the resulting higher nutrient status of this preferred browse species may lead to elevated browsing during seedling establishment.